Fastest PBR Material Workflow for a beginner?
Here's an answer Reddit user Mcurt posted on the Blender sub:

"There are a lot of factors that determine what tool/workflow is the best for texturing. If you're mostly just using PBR texture maps online, there are a bunch of other sites besides Poliigon that offer free textures. I rarely use Poliigon anymore because they don't have free textures, or at least any at decent resolution. Here are some other sources.

https://texturehaven.com/textures/

https://beta.gametextures.com/shop?order=popular

https://www.textures.com/

https://cc0textures.com/tagged/all

https://www.cgbookcase.com/downloads/

If you enable the node wrangler addon, you can ctrl+shift+T on the Principled BSDF node and instantly add your whole PBR shader.

I find Substance Painter to be most useful for mixing multiple materials in a single texture using smart masks, etc. It is probably not quite as necessary for arch viz stuff.

Other than that, procedural materials created in Blender can be really useful too. This requires practice and a bit of studying the node trees of materials you find on the web. I don't know of many up-to-date sources for procedural cycles materials aside from the Cycles Material Vault, which I'd love to pick up some day."